pack: Update win32 nsis script * CMakeLists.txt: Likewise. * src/core/CMakeLists.txt: Likewise. * src/gui/CMakeLists.txt: Likewise. * src/gui/images/nclcomposer.rc -> src/gui/nclcomposer.rc: Renamed. * win32-nsis/nclcomposer.nsis -> win32-nsis/nclcomposer.nsi: Renamed.